高参数涡轮机械气流激振机理及其对转子系统动力学特性影响研究

With the development of the high parameterization of turbomachinery, the internal airflow parameters gradually increase, which in turn sometimes causes the airflow excitation problem and seriously affects the safe operation of the rotor system. This project mainly focuses on the influence of airflow excitation (including seal excitation and tip clearance airflow excitation) on rotor system dynamic characteristics in high-parameter turbine. The influence of key parameters (seal structural parameters and operating parameters) of turbine on the vibration characteristics of the gas flow is studied, and the mutual influence mechanism between the seal excitation and the tip clearance airflow excitation is studied. The calculation model of high-parameter gas turbine dynamic characteristics coefficients is established. The influence law of airflow excitation on the dynamics characteristics and rotor stability of turbine rotor system is studied. The critical rotor speed, unbalance response, mode shape, logarithmic decrement rate and rotational speed of rotor under airflow excitation are solved. To develop the rotor-bearing-seal dynamic model and form a high-parameter turbine rotor stability criterion considering the effect of airflow excitation. The high-parameter turbine airflow excitation test facility is established and the high-parameter turbine airflow excitation test techniques and methods is formed to verify the high-parameter gas turbine dynamic characteristics coefficients calculation model and the high-parameter turbine rotor stability criterion. It provides a theoretical basis for the prevention of airflow excitation in high-parameter turbines and the design of turbine key parameters.

随着涡轮机械向高参数化发展，进气参数逐渐升高，时而引发气流激振问题，严重影响了涡轮机械转子系统的安全运行。本项目以高参数涡轮（如超超临界汽轮机）中的气流激振（含密封及叶顶间隙气流激振）对转子系统动力学特性影响为研究对象，研究涡轮关键参数（密封结构参数及运行参数）对气流激振动特性的影响规律，研究密封激振与叶顶间隙气流激振的相互影响机理，建立高参数涡轮气流激振动特性计算模型；研究气流激振对涡轮转子系统动力学特性及稳定性的影响规律，并计算分析气流激振下转子系统临界转速、不平衡响应、模态振型、对数衰减率、失稳转速等，建立完善转子-轴承-密封动力学模型，形成考虑气流激振效应的高参数涡轮转子稳定性判据；改进建立高参数涡轮气流激振实验台，通过实验验证所建立的气流激振动特性计算模型及转子稳定性判据，形成高参数涡轮气流激振测试技术及方法。为预防高参数涡轮中的气流激振问题及指导涡轮关键参数设计提供理论基础。

随着涡轮机械向高参数化发展，进气参数逐渐升高，时而引发气流激振问题，严重影响了.涡轮机械转子系统的安全运行。本项目以高参数涡轮（如超超临界汽轮机）中的气流激振（含.密封及叶顶间隙气流激振）对转子系统动力学特性影响为研究对象，研究涡轮关键参数（密封.结构参数及运行参数）对气流激振动特性的影响规律，研究密封激振与叶顶间隙气流激振的相.互影响机理，建立高参数涡轮气流激振动特性计算模型；研究气流激振对涡轮转子系统动力学.特性及稳定性的影响规律，并计算分析气流激振下转子系统临界转速、不平衡响应、模态振型.、对数衰减率、失稳转速等，建立完善转子-轴承-密封动力学模型，形成考虑气流激振效应的.高参数涡轮转子稳定性判据；改进建立高参数涡轮气流激振实验台，通过实验验证所建立的气.流激振动特性计算模型及转子稳定性判据，形成高参数涡轮气流激振测试技术及方法。为预防.高参数涡轮中的气流激振问题及指导涡轮关键参数设计提供理论基础。4年中出版专著1本，.发表SCI 论文12篇，EI论文 6篇；获授权国家发明专利5项，申请国家发明专利4项；.培养毕业博士生3名、硕士生12名。